Some diseases are specialised in using sexual behaviour for transmission. Major pandemics including HIV and syphilis have been transmitted via this route, along with the cancer-causing infections Hepatitis B and HPV. Along with these are highly transmissible diseases such as gonorrhoea and herpes. Another way people share bodily fluids is via needles, and several diseases can be transmitted this way, including HIV and Hepatitis. Changing sexual behaviour is hard, so other methods have to be found to control these diseases.